Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.
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Retrieval by Access bug?
Access to client/server database from multiple applications
the database and the persistent fields are initialized, lazily, when the entity object is first accessed ... accessed. The getReference method is useful when a reference to an entity object is required ... are accessed. On the other hand, the default fetch policy of persistent collection and map fields
. There is one case, however, where enhancement is required. Non persistable classes that access directly (not ... (and actually required by JPA but not enforced by ObjectDB) to avoid accessing persistent fields ... this technique persistent fields may only be accessed directly from annotated persistable user classes
these databases accessible to client applications in other processes including ones on other remote ... are: The ability to access and use databases from different processes simultaneously. The ability to access ... , if an ObjectDB database is accessed directly only by a web application, it should be embedded in
objects in a visual debugger. Notice that the same database object may be accessed using different ... the Cache When a database is open in the Explorer in client server mode, it can be accessed simultaneously ... . Using Bookmarks To bookmark an entity object for easier future access - first select it in a viewer
this is used for accessing fields of the candidate object, but it can also be used to reference a candidate ... expressions. Field accessing is not limited to the this reference. Persistent fields of any entity that represents a persistent object can be accessed. This includes fields of parameter objects
your application JDO portable these objects are accessed through the standard JDO interfaces. Obtaining ... . To access a database file directly using embedded mode, specify either its absolute path or its relative ... client server mode should be used to access that database. To use embedded mode, an absolute path or
machine or on different machines) can safely access the database simultaneously, because the database ... ObjectDB as a class library, so no server process is needed in another JVM. The database file is accessed ... files to the classpath is the only requirement. Client-Server mode, however, is useful for accessing